Vacuum-tube light.



No. 646,858. Patented Apr.-3, I900.

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VACUUM TUBE LIGHT.

7 (Application filed Apr. 21, 1899. (No Model.)

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UNITED STATES PATENT OFFICE.

DANIEL MOFARLAN MOORE, OF NEWARK, NEW JERSEY, ASSIGNOR TO THE MOOREELECTRICAL COMPANY, OF NEW YORK, N. Y.

VACUUM-TUBE LIGHT.

SPECIFICATION forming part of Letters Patent No. 646,858, dated April 3,1900.

' Application flledApril 21,1899.

To all whom it may concern.

Be it known that I, DANIEL MGFARLAN MOORE, a citizen of the UnitedStates, and a resident of Newark, in the county of Essex and State ofNew Jersey, have invented a certain new and useful Vacuum Tube Light, ofwhich the following is a specification.

This invention relates to the construction of vacuum-tubes or otherdevices to be used as lamps or sources of light when excited by electricvibrations or other disturbances generated, for instance, by theinterruption of a circuit of induction, as in the manner broadlydisclosed in my Patent No. 548,127, granted October 15, 1895.

In the manufacture of vacuum-light tubes considerable difficulty isexperienced in constructing and mounting terminals or electrodes thereonin such a manner as to produce the best luminous effects and to preventa certain crackling, spitting, or hissing noise while the current ispassing through the tube.

The object of this invention is the elimination of these difficulties;and to that end the invention consists in the construction hereinafterfully described, and set forth in the claims.

In the accompanying drawings, which form a part of this specification,Figure 1 represents a vacuum -light tube provided with the improvedterminals. Fig. 2 represents a variation in the formation of theterminals.

The tube is made from some translucent material, preferably glass, andmay be of any One form is shown at 3,which is simply a straightcylindrical tube closed at its ends. The terminals or caps 4 are addedin the form shown in Fig. 1 by dipping the ends of the tubes into a bathof carbon or graphite paste and then hardening the same by drying orbaking. This adheres closely,

and when a conductor is connected thereto and current turned on there isno noise whatever at the terminals of the tube.

The conductors may be secured to the terminals in any suitable way, asby wrapping Serial No. 713,&'70. (No model.)

them around, as seen at 4 in Fig. 1, or by soldering the conductor to acollar, as 5, Fig. 2, which by means of the graphite paste isfirmly'fixed to the tube. Instead of a band a metal cap, as 6, may beused, which is likewise stuck to the tube by the coating of graphitepaste. A conductor may be soldered to the cap 6, or said cap may be laidor set into any suitable socket to which a circuitterminal is connected.

Other forms of terminal connection for the conductors may be usedwithout departing from the invention, which resides in applying graphiteor carbon to the vacuous tube or chamber at the places where thecircuit-terminals are to be applied; nor is the invention limited todipping a portion of the tube or chamber in a bath of carbon or graphitepaste, since the carbon or graphite may be applied in any convenient waythat will give theproper coating thereof at the appropriate places. Thegraphite tips or spots may be suitably coated to protect the graphiteand to prevent it from soiling things touched by it. This may be done bywrapping tape over it or by coating it with shellac, the circuitterminalhaving first been applied.

The invention claimed is- 1. An electric lamp consisting of a vacuoustube coated exteriorly at its ends with graphite paste to which thecircuit-terminals may be suitably attached.

2. An electric lamp consisting of a vacuous tube coated exteriorly atits ends with a graphite paste, circuit-terminals secured to thegraphite paste, and a protecting-covering added to the graphite pastefor the purpose specified.

Signed at New York, in the county of New York and State of New York,this 7th day of April, A. D. 1899.

DANIEL MOFARLAN MOORE.

\Vitnesses:

WM. I-I. OAPEL, O. L. BELCHEB.

